Spark plug



M. B. HILL.

SPARK PLUG.

' APPLICATION FILED MAY4,192|.

Patented May 16, i922.

@www

MARK B.KHILL,' 0F TICONDEROGA, NEW YORK.

SPARK PLUG.

l Application filed May 4,

T0 @ZZ whom t may concern: n

Be it known that I, MARK B. HILL, a citizen of the United States, residing at Ticonderoga, in the county of Essex and State of New York, have invented new and useful improvements in Spark Plugs, of which the following is a specification. l

This invention relates to spark plugs especially adap-ted for use in internal combustion engines.

An important obj ect of this inventionls to provide a spark plug embodying a pair of disks which are rotated by the vibration and operation of the engine so as to provide constantly changing sparking points for 1n creasing the efficiency and economy of operation of the engine.

A further object is to provide a spark plug having simple means whereby therotatable disks which form the sparking points may be readily renewed when necessary.

The invention forming the subject Inatter of this application aims also toprovide a spark plug which is efficient, simple to app-ly and cheap to manufacture.

Other obj ects and advantages of the invention will be apparent during the course of the following description. t

In the accompanying drawing forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a perspective of the improved spark plug.

Figure 2 is a detail section al view through the same applied.

Figure 3 is a cross sectional view on lines 3-3 of Figure 2.

In the drawing wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 5 designates the head of an internal combustion engine cylinder, which head is provided with the usual screw-threaded opening 6 for the reception of a spark plug.

The spark plug forming the subject matter of this application includes a shell 8 having its forward portion exteriorly screw threaded as indicated at 9 so that the same may be secured within the opening 6.

The shell 8 receives an insulator 10 held in position by means of a sleeve nut 11 and provided with a longitudinally extending electrode 12 to which an electrical conductor is adapted to be connected in the usual manner.

The forward portion of the electrode 12 Specification ofiLetters Patent.

llatente'd llfay 16, 1922.

1921.' Serial No. 466,656,

is formed with a pair of diverging branches 14; arranged at approximately right angles to each other and terminating in spindles or pivot pins 15. A pair of disks 16 are formed with centrally located openings 17 for the reception of the spindles 15 whereby the several disks are rotatably connected to the center electrode 12. With reference to ,F igure 2 it will be observed that the spindles 15 by reason of being reduced define annular shoulders 18 with which the inner sides of the disks contact. The outer sides of the disks 16 are engaged by small washers 18 held on the spindles by upsetting the ends of the spindles to form head 20. The inclination of the several branches 141 disposes each disk with its aXis extending obliquely with relation to the longitudinal axis of the spark plug whereby the periphery of each disk is presented angularly to the forward end of the shell. Each disk is of course spaced slightly from the shell to define a spark gap over which the current jumps for igniting the gases compressed within the cylinder. The inclination of the disks directs the compressed gases laterally to some extent so that any solid particles of oil which may be suspended in the gas will not be permitted to collect on the disks and the inner wall of the shell.

rEhe collection of carbon on the disks is prevented to a high degree since the disks are rotated constantly by the vibration and the periodical compression and combustion of the gases within the cylinder. This also renders the disks self-cleaning to a high degree.

The edges of the disks are beveled as indicated at 22 so as to present relatively wide and flat surfaces to the lower end of the spark plug whereby the sparks are spread over a relatively wide area for completely igniting the gases.

Having thus described the invention what I claim is 1. A spark plug comprising a shell, Aan electrode extending through the shell and having its forward portion formed with diverging branches having reduced spindles forming shoulders. and disks freely rotatable on said spindles and contacting with said shoulders, the edges of said disks being beveled and arranged in spaced relation to the end of the shell and in spaced relation to each other.

2. A spark plug comprising a shell, an

@dieser 3. A spark plug eon'iprising a shell, an

electrode carried thereby, and pair of obhquely arranged dlsks carried by said electrode and cooperating with the forward end olf said shell. in Yforming oppositely LH-ange@ spark gaps.

In. testlinony whereof7 I have aiixed nay signature in the presence of two Witnesses. 20

B/IARK B. HILL. qWitnesses VVINFRED D. MOMURTRY, ARTHUR L. DAVIS. 

